CN1346196A - Serial communication forming redundancy connection method with master-slave unit - Google Patents
Serial communication forming redundancy connection method with master-slave unit Download PDFInfo
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- CN1346196A CN1346196A CN01138560.XA CN01138560A CN1346196A CN 1346196 A CN1346196 A CN 1346196A CN 01138560 A CN01138560 A CN 01138560A CN 1346196 A CN1346196 A CN 1346196A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40189—Flexible bus arrangements involving redundancy by using a plurality of bus systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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Abstract
In a serial communication systems embodied as mono-master system in line topology, the invention achieves tolerance with respect to an arbitrary fault by using an additional return line to the master. This connection serves only for monitoring purposes during normal operation and it is only activated in the event of a line interruption, in order to undertake the communication to the 'isolated' subscribers. In this case, two independent lines exist from the master to the slaves.
Description
Technical field
The present invention relates to a kind of being used for has a master unit and a plurality of serial communication systems from the unit produce the redundant methods that are connected, and described unit is arranged with embarking on journey of point-to-point interconnection in linear topological diagram and interconnected; Also relating to corresponding have a master unit and a plurality of serial communication system from the unit, embarks on journey with point-to-point interconnection in linear topological diagram and arranges interconnection in described unit.
Background technology
Serial communication system is flexibly for the interruption that the transmission coal is situated between in principle, because interrupt making that the user who is in the breakpoint back can't realize communication.This situation especially takes place in the serial communication system that connects through bus system.This communication system has a plurality of communication user TL1 to TLn, sees shown in Fig. 1 a.All through line driver or the communication interface Kom_E1 and the communication network of special use, promptly the bus system B's among the communication user TL1 to TLn each among the figure links to each other.
If this moment, breakpoint appearred in bus system, the communication that then is positioned at the communication user of breakpoint back will be cut off, because this user can not receive data there from the communication user that is positioned at the breakpoint front, perhaps send data to the latter.If breakpoint occurs over just between bus system and the user's communications electronic circuit Kom_E1, then have only the communication of this communication user to be cut off.
The failure rate that hinders for some reason and cause is owing to following former thereby rapid rising, and promptly communication line is not to exist as bus B, but arranges existence as the embarking on journey of point-to-point connection of linear topology figure.This serial communication system based on linear topology figure is seen shown in Fig. 1 b.This communication user TL1 to TLn is provided with linear the interconnecting of L1 to L (n-1) that connect respectively between the Electronic Circuit of Communication Kom_E1 of neighboring user.The quantity that employed number of, lines equals communication user subtracts 1.
Many in this case connectors connect, and also have needed Electronic Circuit of Communication Kom_E1 in each communication user TL1 to TLn, so constituted the potential source of trouble.In addition, if this structure exists with the arrangement mode of embarking on journey of the point-to-point connection of linear topology figure, then not have communication disruption be impossible in the exchange of each user TL1 to TLn.
Usually adopting dual circuit owing to the communication disruption that circuit damages or out of order connector causes is dangerous is that redundant circuit obviously reduces.Processing method in this prior art is seen shown in Fig. 2 a.Wherein except being provided with the first bus system B1, also be provided with the second bus system B2, this system links to each other with all communication users equally.Additional expense also produces therefrom, because must provide two independently Electronic Circuit of Communication Kom_E1 for each communication user, is used for each bus system B1 and B2.
Another problem is in the point-to-point connection (linear topology figure) of link, exchange between each user only could realize in following situation that promptly the communication point circuit is independent of the user, that is to say, can structurally separate and have independently power supply, for example dispose " bus cable ".This line interruption problem produces owing to communication user exchanges, and adopts above-described known solution, sees shown in Fig. 2 b.But the problem of high failure rate is not resolved by any way.
This problem is present in the single master unit communication system with point-to-point connection of interlinkage (linear topology figure) especially, and communication user wherein comprises a master unit and a plurality of from the unit.
Summary of the invention
Purpose of the present invention is sought a kind of possibility, in the serial communication system with the point-to-point connection of interlinkage, even if occurring can also guaranteeing reliable communication under the situation of line interruption, need not to arrange dual cable between all communication users.
To achieve these goals, a kind of have a master unit and a plurality of serial communication system from the unit are provided, interconnection is arranged with embarking on journey of point-to-point interconnection in its unit in linear topological diagram, it is characterized in that, additional connection between two line terminal users, particularly on the line apart from master unit connecting farthest, be used for when linear topological diagram generation line interruption, taking over and lead to the communication of being isolated from the unit from the unit to additional this between the master unit.
Wherein being proved to be favourable scheme is, described additional connection only just is activated when linear topological diagram generation line interruption.
To this, described additional being connected can be used for monitoring purposes in the operate as normal.
This is proved to be favourable scheme is, has detection line interruption, the particularly device of accidental interruption in linear topological diagram, activates described additional connection by this device.Can be communicated with activation master unit and segregate communicating by letter between the unit by described additional connection and master unit with this scheme.Especially advantageously, described checkout gear is arranged in the master unit.
If the loop-around data by exchange in transmission circulation carries out the synchronous data transmission in the described communication line, then favourable scheme is, respectively has counter from the unit at each data direction, is used for limiting the valid data that last transmission circulation transmits.Wherein said corresponding counts device state from the unit can be used as in each transmission circulation to the part of the data of master unit transmission, according to all counter status from the unit line interruption is positioned in master unit.
Described distant serial synchronous telecommunications system can identify the loss situation of master unit to the quantity of the loop-around data that transmits from the unit based on line interruption, its favourable scheme is, in master unit, be arranged in the counter status from the unit of linear topology figure abort situation back certainly, line interruption is positioned with the direction of master unit.
If identify the loss situation that transmits the quantity of loop-around data from the unit to master unit based on line interruption, then favourable scheme is, in master unit, be arranged in the counter status from the unit of the abort situation front of linear topology figure certainly, line interruption is positioned with the direction of master unit.
According to another advantageous embodiment, described checkout gear is arranged on the microprocessor through suitable programming of having in the master unit.
In addition, the above purpose also is to provide a kind of being used for having a master unit and a plurality of redundant methods that are connected of serial communication systems generation from the unit, embark on journey with point-to-point interconnection in linear topological diagram and arrange interconnection in described unit, feature of the present invention comprises following method step:
-between two line terminal users, set up additional the connection, especially on the line apart from master unit farthest from the unit to additional this connection between the master unit;
Take over during-linear topology figure generation line interruption and lead to the communication of being isolated from the unit.
In a kind of advantageous embodiments, following method step is proved to be favourable:
-when linear topological diagram generation line interruption, activate to the communication of being isolated from the unit through described additional connection;
-sent information through described additional connection to isolating from the unit, inform and must could insert master unit through additional the connection.
As the batch (-type) line interruption appears, then following method step is taked in the present invention's suggestion:
-described line interruption is positioned;
-produce the interruption that continues by issuing the last message that is positioned at the interruption position front, to stop to transmit data from the unit.
Synchronous data transmission as described in carrying out as the loop-around data of need by exchange in transmission circulation in the communication line, then the following method step that is used for the line interruption location is taked in the present invention's suggestion:
-transmit the valid data that send in cycles at each data direction at last to respectively detecting from the unit;
-quantity from the unit that is detected is reached master unit, as the part of the data that in each transmission circulation, transmit to master unit;
-according to all numerical value that receive line interruption is positioned from the unit.
For identify the failure conditions of master unit based on line interruption, can take following advantageous method step to the quantity of the loop-around data that transmits from the unit:
-in master unit, be arranged in the numerical value from the unit of the abort situation back of linear topology figure certainly with the direction of master unit, line interruption is positioned.
Identify from the unit failure conditions of the quantity of the loop-around data that transmits to master unit as need based on line interruption, then following method step is taked in the present invention's suggestion:
-in master unit, be arranged in the numerical value that sends from the unit of the abort situation front of linear topology figure certainly with the direction of master unit, line interruption is positioned.
For the serial communication system of the single master unit system that adopts linear topology figure, can higher tolerance be arranged to fault arbitrarily by the present invention, because used the additional return line that is communicated with master unit.This is connected and only plays supervisory function bit under the normal operation.It has only in the line and just to be activated when disconnected, leads to " by isolating " user's communications thereby take over.In this case, at master unit with from there being two independently circuits between the unit.
Description of drawings
By the description of carrying out below in conjunction with the accompanying drawing that an example exemplarily is shown, above-mentioned and other purposes of the present invention and characteristics will become apparent.The device that this is had identical function adopts identical mark.
Fig. 1 a represents to have the serial communication system of the linear topology figure of bus system;
Fig. 1 b represents to have the embark on journey serial communication system of the linear topology figure that arranges of point-to-point connection;
Serial communication system shown in Fig. 2 a presentation graphs 1a, it has second bus system in the prior art;
Serial communication system shown in Fig. 2 b presentation graphs 1b, it has the Electronic Circuit of Communication that has nothing to do with the user;
Fig. 3 represents serial communication system of the present invention, and it has the return line under normal operation;
Fig. 4 represents serial communication system of the present invention, and it has the return line under the disconnected in the line situation;
Fig. 5 represents the quantity with serial communication system loop-around data under normal operation of return line of the present invention;
Fig. 6 represents the quantity with serial communication system loop-around data under the temporary line failure condition of return line of the present invention.
Below, describe embodiments of the invention in detail with reference to accompanying drawing.
Shown in Fig. 1 a, 1b and Fig. 2 a, 2b, wherein prior art has been made detailed description in front.In Fig. 3, express serial communication system of the present invention, had the return line under normal operation.This communication network architecture be equivalent to basically Fig. 1 b shown in structure, promptly have the embark on journey serial communication system of the linear topology figure that arranges of point-to-point connection, be used for the communication between the communication user.
To the single master unit network of this expression, wherein master unit M is arranged on the circuit end points usually, and is provided with a plurality of from cell S L1 to SLn.Master unit and first is connected L1 from cell S L1 by cable and links to each other, link to each other through second cable L2 from cell S L2 from cell S L1 with second, and the like, until last with link to each other through cable L (n-1) from cell S Ln.Each cable can comprise two circuits and be used for two-way complete multiplexing connection, wherein by master unit M to being transferred to definite value, since cell S L1 to SLn transmits corresponding actual value towards master unit M direction from cell S L1 to SLn.Communication between each user especially adopts data T to carry out, and these data realize exchange through communication network.
According to the present invention, in the end one has been returned return line L+ from cell S Ln between the master unit M.If master unit M is not arranged on the terminal of circuit, then described return line L+ can two as the line terminal user between the unit.The ring topology figure that is produced is identical in two kinds of situations, so the described principle of work and power can be used in two kinds of situations.To introduce the common topological diagram that master unit M is positioned at the line terminal below.
Fig. 4 represents serial communication system of the present invention as shown in Figure 3, has the return line under the disconnected in the line U situation.For example appear between cell S L2 and the SL3 at the line interruption U of this appearance.Therefore circuit L2 interrupts.
In order between all user M, SL1 to SLn, to keep communicating to connect, return line L+ must be activated.With the direction of master unit M, this moment through two line communications, one be through before linear topology figure lead to from cell S L1 by circuit L1, in addition through return line L+ as the second communication line.By this second communication line can be communicated with all be positioned at line interruption U back from the unit, its mode is by the cable or wire L (n-1) of second circuit L+ correspondence+to L3+.The obvious characteristic of the latter's connection is that its cable uses "+" to indicate equally.
Obvious advantage of the present invention is, adopts minimum hardware costs, because only additionally need a unique cable L+ just can overcome above-described all obstacles.Other functions can provide in the Electronic Circuit of Communication of unit or in the software scope at master unit, to also being described in detail below this.
Realize compatible with line interruption U in the single master unit system of leading to that the return line of master unit M can be in Fig. 3 and linear topology figure shown in Figure 4 by increase utterly.Its condition is to adopt following method, and is promptly reliably a kind of and promptly detect the method for interruption U, even interrupt occurring suddenly, and can also quick active return line L+.
Process when breaking down is seen the following stated:
1. chance failure U is positioned.
2. set up the interruption that continues, thereby guarantee the irrelevance of two communication lines.
Master unit promptly stops data path to giving an order from cell S L1 to taking place to disturb the last user before connecting to give an order for this reason.
3. activate second communication circuit L+, L (n-1)+... L3+.
Send message to segregate user this moment, informs that its master unit M will be that return line L+ is communicated with through the second communication circuit.Carry out exchanges data at second circuit then.
After fault U is eliminated, come back to normal operating conditions according to the following steps:
To second communication circuit L+, L (n-1)+... user on the L3+ sends message, notifies its communication will switch to the first initial communication line L1 again ... on the L (n-1).
2. elimination interruption U.
Master unit M gives an order to the end user before the faulty line for this reason, promptly to giving an order from cell S L1, is communicated with data T again.
3. on return line L+, activate the monitoring function that to carry out again.
This method can be used as impulsive synchronization communication for following situation and implements.Major requirement in this application is, (may be accidental) line fault U occurs and activates between the second communication line, and promptly in interference-free was proceeded communication process between all users, the bus cycle that allows deletion was less than 2.
The most difficult task is reliably sporadic fault U to be positioned, and this fault may only be the unique data T that caused damage.According to the present invention, its solution is as follows:
Be equipped with two counters from the unit respectively,, the quantity of effective loop-around data of transmitting in the last transmission circulation detected so that be used for two data directions of complete multiplexing connection independently.
Transmit in the circulation by described redundant the selection, expanding to counter status to the disposable data that master unit M sends at each from cell S L1 to SLn.
Master unit M controller for example adopts the task of software mode to be, measures all faults from cell S L1 to SLn and connect from counter status.The present invention to the solution of this problem mainly based on following understanding, promptly all must be in n data of " set-point (Sollwert) direction " transmission equal number from cell S L1 to SLn, and on " actual value direction ", can reduce 1 respectively from the unit to the data bulk that transmits towards master unit M direction from the unit.This relation is seen shown in Figure 5, and wherein each cable L1 to L (n-1) and L+ comprise two circuits as mentioned above.Article one, effect is to go up communication (solid line) in " set-point direction ", and another effect is to go up communication (dotted line) in " actual value (Istwert) direction ".
Corresponding to existing quantity from cell S L, the quantity by master unit M sends n data sends to from cell S L1 to SLn towards " set-point direction ".Respectively must transmit this n data each from cell S L1 to SLn.Otherwise will enter " actual value direction ", respectively send data from the unit to master unit M this moment.And apart from master unit M farthest needn't transmit data from cell S Ln, on " actual value direction ", see at last from cell S L1 must transfer data to " being positioned at the front " from cell S L2 to SLn, i.e. n-1 data.
For example because the sporadic interruption U of circuit m, first lost efficacy between cell S L2 from cell S L1 and second on the set-point direction by the loop-around data of master unit M, then all are arranged in the later user SL2 to SLn of abort situation U transmits corresponding minimizing in next one circulation on the set-point direction data (n-m).This situation is seen shown in Figure 6, is illustrated in first among the figure when occurring the patch fault from cell S L1 and second between cell S L2, the quantity of loop-around data.Adopted the serial communication system with return line L+ of the present invention among the figure.
If fault relates to the actual value direction, to be k to the data bulk that master unit M sends from cell S L2 to SLn, then according to the quantity of data, can measure fault, this quantitaes user is promptly from the login of cell S L1 before abort situation U.
Situation shown in Figure 6 is represented following hypothesis, at abort situation U place, loses loop-around data owing to accidental line fault at set-point direction m with on actual value direction k.
The invention is not restricted to the foregoing description, without departing from the present invention, can carry out various changes and modifications.
This specification based on.Its content all is contained in this.
The present invention has the utilizability on the industry.
Label declaration
The M master unit
SL1 bis SLn is from the unit
TL1 bis TLn communication user
B, B1, B2 bus system
The quantity of the data that the quantity k actual value direction of the data that the data bulk m set-point direction that L1 bis L (n-1) optical cable or circuit Kom_E1 Electronic Circuit of Communication L+ return line L3+, L (n-1)+second communication circuit U line interruption n transmits is interrupted is interrupted
Claims (15)
1. serial communication system, it has a master unit (M) and a plurality of from unit (SL1 ... SLn), it is at linear topological diagram (L1 ... L (n-1)) embarks on journey with point-to-point interconnection in and arrange interconnection, it is characterized in that, at two line terminal user (M, SLn) an additional connection (L+) between, especially at circuit (L1 ... L (n-1)) go up apart from master unit (M) farthest from unit (SL1 ... SLn) to additional this connection between the master unit (M), be used at linear topological diagram (L1 ... adapter is led to segregate from unit (SL1 when L (n-1)) line interruption (U) taking place ... SLn) communication.
2. according to the described serial communication system of claim 1, it is characterized in that described additional connection (L+) is only at linear topological diagram (L1 ... just be activated when L (n-1)) line interruption (U) taking place.
3. according to claim 1 or 2 described serial communication systems, it is characterized in that described additional connection (L+) is used for monitoring purposes in operate as normal.
4. according to claim 2 or 3 described serial communication systems, it is characterized in that having a kind of at linear topological diagram (L1 ... L (n-1)) detection line interrupts the device of (U), especially accidental interruption in, activates described additional connection (L+) with this device.
5. according to the described serial communication system of claim 4, it is characterized in that described checkout gear is arranged in the master unit (M).
6. according to claim 4 or 5 described serial communication systems, wherein carry out described communication line (L1 by the circulation telegram (n) of exchange in the transmission circulation ... L (n-1)) synchronous data transmission in, it is characterized in that, respectively from unit (SL1 ... SLn) on each data direction, has a kind of counter, be used for detecting effective telegram (n) that last transmission circulation is transmitted, wherein said from unit (SL1 ... SLn) corresponding counts device state can be used as the part of the telegram (T) that transmits to master unit (M) in each transmission circulation, be sent to master unit (M) from the slave unit, in master unit according to all from unit (SL1 ... SLn) counter status positions line interruption (U).
7. according to the described distant serial synchronous telecommunications of claim 6 system, can identify master unit (M) to from unit (SL1 based on line interruption (U) ... SLn) failure conditions of the quantity (m) of the circulation telegram (n) of Chuan Songing, it is characterized in that, in master unit (M), according to the side at master unit (M) look up, by being positioned at linear topology figure (L1 ... L (n-1)) abort situation (U) back in from unit (SL1 ... SLn) counter status that sends, (U) positions to line interruption.
8. according to claim 6 or 7 described distant serial synchronous telecommunications systems, it is characterized in that, can identify from unit (SL1 based on line interruption (U) ... SLn) failure conditions of the quantity (k) of the circulation telegram (n) that transmits to master unit (M), it is characterized in that, in master unit (M), according to the side at master unit (M) look up, by being positioned at linear topology figure (L1 ... L (n-1)) abort situation (U) front in from unit (SL1 ... SLn) counter status that sends, (U) positions to line interruption.
9. according to each described serial communication system in the claim 5 to 8, it is characterized in that described checkout gear is a microprocessor through suitable programming of having that is arranged in the master unit (M).
10. one kind is used for having a master unit (M) and a plurality of from unit (SL1 ... SLn) produce the redundant method that connects (L+) in the serial communication system, described unit is at linear topological diagram (L1 ... L (n-1)) embark on journey with point-to-point interconnection in and arrange interconnection, it is characterized in that comprising following method step:
-between two line terminal users (M, SLn), set up additional connect (L+), especially at circuit (L1 ... L (n-1)) goes up apart from master unit (M) additional this connection between (M) farthest from the unit to master unit;
-be used at linear topological diagram (L1 ... take over when L (n-1)) line interruption (U) taking place and lead to the communication of being isolated from the unit.
11., it is characterized in that also comprising following method step according to the described method that is used for producing redundant connection (L+) of claim 10 at serial communication system:
-at linear topological diagram (L1 ... when L (n-1)) line interruption (U) taking place, activate to the communication of being isolated from the unit through described additional connection (L+);
-sent information through described additional connection (L+) to isolating from the unit, inform and must could insert master unit (M) through additional the connection (L+, L3+, L (n-1)+).
12. according to claim 10 or the 11 described methods that are used for producing redundant connection (L+), batch (-type) line interruption (U) wherein can occur, it is characterized in that also comprising following method step at serial communication system:
-described line interruption (U) is positioned;
-produce a lasting interruption (U) by issuing last the message that is positioned at interruption position (U) front, to stop to transmit telegram (T) from the unit.
13. according to each described method that is used for producing redundant connection (L+) in the claim 10 to 12 at serial communication system, wherein carry out described communication line (L1 by the circulation telegram (n) of exchange in the transmission circulation ... L (n-1)) synchronous data transmission in is characterized in that also comprising the following method step that is used for line interruption (U) location:
-on each data direction to respectively from unit (SL1 ... SLn) detect the effective telegram (n) that transmits in last transmission circulation;
-with (SL1 that is detected from the unit ... SLn) quantity reaches master unit (M), as the part of the telegram of transmitting to master unit (M) in each transmission circulation (T);
-according to receive all from unit (SL1 ... SLn) numerical value positions line interruption (U).
14. according to the described method that is used for producing redundant connection (L+) of claim 13 at serial communication system, can identify master unit (M) to from unit (SL1 based on line interruption (U) ... SLn) loss situation of the quantity (m) of the circulation telegram (n) of Chuan Songing is characterized in that also comprising following method step:
-in master unit (M), according to the side at master unit (M) look up, by being positioned at linear topology figure (L1 ... the numerical value that sends from the unit of abort situation (U) back L (n-1)), (U) positions to line interruption.
15. according to claim 13 or the 14 described methods that are used for producing redundant connection (L+) at serial communication system, can identify from unit (SL1 based on line interruption (U) ... SLn) loss situation of the quantity (k) of the circulation telegram of transmitting to master unit (M) (n) is characterized in that comprising following method step:
-in master unit (M), look up, be positioned at certainly linear topology figure (L1 according to side at master unit (M) ... L (n-1)) abort situation (U) front in from unit (SL1 ... SLn) numerical value that sends, (U) positions to line interruption.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10047923.5 | 2000-09-27 | ||
| DE10047923A DE10047923C2 (en) | 2000-09-27 | 2000-09-27 | Method for generating a connection redundancy for a serial communication system with a master unit and a plurality of slave units, which are connected to one another as a series of point-to-point connections in line topology, and a corresponding serial communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1346196A true CN1346196A (en) | 2002-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01138560.XA Pending CN1346196A (en) | 2000-09-27 | 2001-09-10 | Serial communication forming redundancy connection method with master-slave unit |
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| Country | Link |
|---|---|
| US (1) | US20020040452A1 (en) |
| EP (1) | EP1193916A3 (en) |
| CN (1) | CN1346196A (en) |
| DE (1) | DE10047923C2 (en) |
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- 2000-09-27 DE DE10047923A patent/DE10047923C2/en not_active Expired - Fee Related
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- 2001-07-31 US US09/918,593 patent/US20020040452A1/en not_active Abandoned
- 2001-09-10 CN CN01138560.XA patent/CN1346196A/en active Pending
- 2001-09-14 EP EP01122108A patent/EP1193916A3/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101309619B (en) * | 2005-11-15 | 2011-08-31 | 利纳克有限公司 | A communications method, in particular for hospital and nursing beds |
| CN101919210A (en) * | 2008-02-06 | 2010-12-15 | 西门子公司 | Group master communication system and method for serially transmitting data in automation systems |
| CN101919210B (en) * | 2008-02-06 | 2013-05-29 | 西门子公司 | Group master communication system and method for serially transmitting data in automation systems |
| US8578077B2 (en) | 2008-02-06 | 2013-11-05 | Siemens Aktiengesellschaft | Group master communication system and method for serially transmitting data in automation systems |
| CN110771100A (en) * | 2017-07-07 | 2020-02-07 | 欧姆龙株式会社 | Control system and control method |
| CN110771100B (en) * | 2017-07-07 | 2022-04-05 | 欧姆龙株式会社 | Control system and control method |
| US11563599B2 (en) | 2017-07-07 | 2023-01-24 | Omron Corporation | Control system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10047923C2 (en) | 2003-04-10 |
| DE10047923A1 (en) | 2002-05-02 |
| EP1193916A3 (en) | 2003-10-08 |
| US20020040452A1 (en) | 2002-04-04 |
| EP1193916A2 (en) | 2002-04-03 |
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